Why do i fall asleep and awaken drenched in sweat after I have a shake or cereal with milk?

This does not happen with cheese or other dairy products. I fall asleep fast and wake up feeling like I have hangover. I am not a diabetic. I have been tested many times. I am partially lactose intolerant, I don't get an upset stomach or diarrhea. I do get horrific gas, but only with cereal and milk shakes. By the way, I never drink milk alone.